1HZ Economy

[whoneedsbitumen]

Started a new job last week and i now have to drive about 70 km each way to get to work.
Last 2 tanks i have worked out to be about 15.7 L/100km, which i think is a bit high, have read somewhere that some people get alot lower figures than that.
SO what can i do to get better mileage, money doesnt permit a snorkel for a month or 2 but im guessing thats a start.
Currently has extractors and a 2 1/2"(i Think) exhuast, 33 inch tires.
Its due for filters (oil and fuel & air) to be done soon.

7/91 HZJ75 trayback with about 396 800km on the clock reasonably good motor blows a little bit of smoke.

Think ive covered everything

Thanks
Adam

[Shadow]

should be closer to 12L/100 unless you have a big load on

I dont imagine a snorkel is going to drastically imporove your efficiency.

What size tyres? bigger tyres = poorer fuel economy

also what speed are you driving at, 1Hz likes to sit on 100 for good economy.

[joel HJ60]

Service it, lose any unneeded weight, smaller tyres will help immensely and about 100km/h is max. Giddy up

[whoneedsbitumen]

I was thinking along the lines with a snorkel more cooler cleaner air better economy, i maybe wrong though (Have been before)
No load at all, trayback with no sides 95% of the time
Running 33's as stated above
I didnt mention that i usually average about 105-110 km/h

[Shadow]

I was thinking along the lines with a snorkel more cooler cleaner air better economy, i maybe wrong though (Have been before)
No load at all, trayback with no sides 95% of the time
Running 33's as stated above
I didnt mention that i usually average about 105-110 km/h

thats still wierd, when i drive my 2H at 110 i still get high 13's. 1HZ is a more efficient engine and i believe is geared a little higher so yours should be able to do 110 and still give very good fuel economy, sub 13 anyway.

[thomasando]

Mine gets about 13.3L/100km around town, and anywhere from 12 to 13 on a long highway run. That's on skinny tyres....

[shanegtr]

I've found that 100 is its sweetspot, or around 2400rpm

[CV Smasher]

My missus drives ours 50km each way to work avg 80km/h and gets 11-12 L/100 in a stock 80 with 31's.

[Dane]

Mine used to get about 12.5 around town and a bit less on the highway. 80km/h is about the best economy you get but too slow, and push it over 100km/h on the highway and you pay for it.

[Gazza the Chippy]

My 1hz turboed is doing about 17-19 per 100 so I reckon your doing okay, mind you I do have a heavy foot

[whoneedsbitumen]

65 of the 70 km trip is on the highway, today i sat on 100 all the way , man seemed to take forever , will see how it goes.


Thanks for the replies

Adam

[fj60efi_]

Possibly something you have already calculated??? -> but have you worked it out with the accuracy of your speedo/taco included in your calcs??
Ie. if your running 33's possibly your speedo/taco is reading low and therefore you may have done more kms per litre than you think. From experience my 35's were reading around 10% over, 33's about 3% over, 31's about 4% under and 275/70R16's are spot on (FJ62). This directly affects your fuel economy if you don't include it in your calcs.

ps. GPS is the best way to work out speedo accuracy.

[Rough60]

fj60 is spot on with the tyre size calcs and using a gps.
I've got a turbo 1hz in a 100 that gets 12.3 just running around.
Cheers.

[Shadow]

Possibly something you have already calculated??? -> but have you worked it out with the accuracy of your speedo/taco included in your calcs??
Ie. if your running 33's possibly your speedo/taco is reading low and therefore you may have done more kms per litre than you think. From experience my 35's were reading around 10% over, 33's about 3% over, 31's about 4% under and 275/70R16's are spot on (FJ62). This directly affects your fuel economy if you don't include it in your calcs.

ps. GPS is the best way to work out speedo accuracy.

3% is going to make it 15.3 instead of 15.7

[DIRTY ROCK STAR]

In a stock 80 but with winch etc, i get around 10-12litre per 100km.

[Toy80Diesel]

Slightly modded 80, 2" lift, 285 tyres, snorkel.
Was getting 12.5/100km on long drives and a little more in the city.

Now Turbo, but still to check the economy, once I get over the fun of driving it with the turbo

By the way, had it dynoed and speedo tested, only 3.3km difference at 100km.

[whoneedsbitumen]

Speedo is within a K or 2 at 100km

[philhod]

I lost about 100km a tank when I put the 33" mud terrains on. Used to get about 650km out of a tank on 31's, but after the 33's went on it dropped it back to 550km before I had to fill it up. This is on a '93 1HZ 75 series as well.

Maybe get some 31's for everyday driving and put the 33's on when you head bush. You will notice the difference.